diff --git a/GLCriticalSection.h b/GLCriticalSection.h
deleted file mode 100644
index b994c5ee..00000000
--- a/GLCriticalSection.h
+++ /dev/null
@@ -1,37 +0,0 @@
-#ifndef GLCRITICALSECTION_H
-#define GLCRITICALSECTION_H
-
-#include <mutex> // std::mutex
-
-class GLCriticalSection
-{
-public:
-	void lock()
-	{
-		m_mtx.lock();
-		m_locked = true;
-	}
-
-	void unlock()
-	{
-		m_locked = false;
-		m_mtx.unlock();
-	}
-
-	bool isLocked() const {return m_locked;}
-
-protected:
-	class Lock {
-	public:
-		Lock(GLCriticalSection * _pCS) : m_pCS(_pCS) {m_pCS->lock();}
-		~Lock() {m_pCS->unlock();}
-	private:
-		GLCriticalSection * m_pCS;
-	};
-
-private:
-	std::mutex m_mtx;
-	bool m_locked;
-};
-
-#endif // GLCRITICALSECTION_H
diff --git a/GLideN64.vcxproj b/GLideN64.vcxproj
index c7adc3ec..7aead5f2 100644
--- a/GLideN64.vcxproj
+++ b/GLideN64.vcxproj
@@ -345,7 +345,6 @@
     <ClInclude Include="FrameBuffer.h" />
     <ClInclude Include="GBI.h" />
     <ClInclude Include="gDP.h" />
-    <ClInclude Include="GLCriticalSection.h" />
     <ClInclude Include="glext.h" />
     <ClInclude Include="GLideN64.h" />
     <ClInclude Include="gSP.h" />
diff --git a/GLideN64.vcxproj.filters b/GLideN64.vcxproj.filters
index e4b4b5cd..c1a4df66 100644
--- a/GLideN64.vcxproj.filters
+++ b/GLideN64.vcxproj.filters
@@ -305,9 +305,6 @@
     <ClInclude Include="Log.h">
       <Filter>Header Files</Filter>
     </ClInclude>
-    <ClInclude Include="GLCriticalSection.h">
-      <Filter>Header Files</Filter>
-    </ClInclude>
   </ItemGroup>
   <ItemGroup>
     <ResourceCompile Include="Resource.rc">
diff --git a/PluginAPI.h b/PluginAPI.h
index b672fef8..38665aad 100644
--- a/PluginAPI.h
+++ b/PluginAPI.h
@@ -1,17 +1,34 @@
 #ifndef COMMONPLUGINAPI_H
 #define COMMONPLUGINAPI_H
 
+#include <thread>
+#include <condition_variable>
+
 #ifdef MUPENPLUSAPI
 #include "m64p_plugin.h"
 #else
 #include "ZilmarGFX_1_3.h"
+#define RSPTHREAD
 #endif
 
-#include "GLCriticalSection.h"
+enum API_COMMAND {
+	acNone = 0,
+	acProcessDList,
+	acUpdateScreen,
+	acRomClosed
+};
 
-class PluginAPI : public GLCriticalSection
+class PluginAPI
 {
 public:
+#ifdef RSPTHREAD
+	~PluginAPI()
+	{
+		delete m_pRspThread;
+		m_pRspThread = NULL;
+	}
+#endif
+
 	// Common
 	void MoveScreen(int /*_xpos*/, int /*_ypos*/) {}
 	void ProcessRDPList() {}
@@ -70,10 +87,24 @@ public:
 	}
 
 private:
-	PluginAPI() {}
+	PluginAPI()
+#ifdef RSPTHREAD
+		: m_pRspThread(NULL), m_command(acNone)
+	#endif
+	{}
 	PluginAPI(const PluginAPI &);
 
-	void _initiateGFX(const GFX_INFO & _gfxInfo);
+	void _initiateGFX(const GFX_INFO & _gfxInfo) const;
+
+#ifdef RSPTHREAD
+	void _callAPICommand(API_COMMAND _command);
+	std::mutex m_rspThreadMtx;
+	std::mutex m_pluginThreadMtx;
+	std::condition_variable_any m_rspThreadCv;
+	std::condition_variable_any m_pluginThreadCv;
+	std::thread * m_pRspThread;
+	API_COMMAND m_command;
+#endif
 };
 
 inline PluginAPI & api()
diff --git a/common/CommonAPIImpl_common.cpp b/common/CommonAPIImpl_common.cpp
index a0218e89..f5d4e8fd 100644
--- a/common/CommonAPIImpl_common.cpp
+++ b/common/CommonAPIImpl_common.cpp
@@ -3,6 +3,7 @@
 #else
 # include "../winlnxdefs.h"
 #endif // _WINDOWS
+#include <assert.h>
 
 #include "../PluginAPI.h"
 
@@ -12,16 +13,75 @@
 #include "../RSP.h"
 #include "../VI.h"
 #include "../Debug.h"
+#include "../Log.h"
+
+#ifdef RSPTHREAD
+void RSP_ThreadProc(std::mutex * _pRspThreadMtx, std::mutex * _pPluginThreadMtx, std::condition_variable_any * _pRspThreadCv, std::condition_variable_any * _pPluginThreadCv, API_COMMAND * _pCommand)
+{
+	_pRspThreadMtx->lock();
+	RSP_Init();
+	OGL_ResizeWindow();
+	assert(!isGLError());
+
+	while (true) {
+		_pPluginThreadMtx->lock();
+		_pPluginThreadCv->notify_one();
+		_pPluginThreadMtx->unlock();
+		_pRspThreadCv->wait(*_pRspThreadMtx);
+		switch (*_pCommand) {
+		case acProcessDList:
+			RSP_ProcessDList();
+			break;
+		case acUpdateScreen:
+			VI_UpdateScreen();
+			break;
+		case acRomClosed:
+			OGL_Stop();
+			GBI_Destroy();
+			*_pCommand = acNone;
+			_pRspThreadMtx->unlock();
+			_pPluginThreadMtx->lock();
+			_pPluginThreadCv->notify_one();
+			_pPluginThreadMtx->unlock();
+			return;
+		}
+		assert(!isGLError());
+		*_pCommand = acNone;
+	}
+}
+
+void PluginAPI::_callAPICommand(API_COMMAND _command)
+{
+	m_command = _command;
+	m_pluginThreadMtx.lock();
+	m_rspThreadMtx.lock();
+	m_rspThreadCv.notify_one();
+	m_rspThreadMtx.unlock();
+	m_pluginThreadCv.wait(m_pluginThreadMtx);
+	m_pluginThreadMtx.unlock();
+}
+#endif
 
 void PluginAPI::ProcessDList()
 {
-	Lock lock(this);
+	LOG(LOG_APIFUNC, "ProcessDList\n");
+#ifdef RSPTHREAD
+	_callAPICommand(acProcessDList);
+#else
 	RSP_ProcessDList();
+#endif
 }
 
 void PluginAPI::RomClosed()
 {
+	LOG(LOG_APIFUNC, "RomClosed\n");
+#ifdef RSPTHREAD
+	_callAPICommand(acRomClosed);
+	delete m_pRspThread;
+	m_pRspThread = NULL;
+#else
 	OGL_Stop();
+#endif
 
 #ifdef DEBUG
 	CloseDebugDlg();
@@ -30,9 +90,17 @@ void PluginAPI::RomClosed()
 
 void PluginAPI::RomOpen()
 {
+	LOG(LOG_APIFUNC, "RomOpen\n");
+#ifdef RSPTHREAD
+	m_pluginThreadMtx.lock();
+	m_pRspThread = new std::thread(RSP_ThreadProc, &m_rspThreadMtx, &m_pluginThreadMtx, &m_rspThreadCv, &m_pluginThreadCv, &m_command);
+	m_pRspThread->detach();
+	m_pluginThreadCv.wait(m_pluginThreadMtx);
+	m_pluginThreadMtx.unlock();
+#else
 	RSP_Init();
-
 	OGL_ResizeWindow();
+#endif
 
 #ifdef DEBUG
 	OpenDebugDlg();
@@ -46,11 +114,15 @@ void PluginAPI::ShowCFB()
 
 void PluginAPI::UpdateScreen()
 {
-	Lock lock(this);
+	LOG(LOG_APIFUNC, "UpdateScreen\n");
+#ifdef RSPTHREAD
+	_callAPICommand(acUpdateScreen);
+#else
 	VI_UpdateScreen();
+#endif
 }
 
-void PluginAPI::_initiateGFX(const GFX_INFO & _gfxInfo) {
+void PluginAPI::_initiateGFX(const GFX_INFO & _gfxInfo) const {
 	DMEM = _gfxInfo.DMEM;
 	IMEM = _gfxInfo.IMEM;
 	RDRAM = _gfxInfo.RDRAM;
diff --git a/mupenplus/CommonAPIImpl_mupenplus.cpp b/mupenplus/CommonAPIImpl_mupenplus.cpp
index cb081cb8..8bd71e1a 100644
--- a/mupenplus/CommonAPIImpl_mupenplus.cpp
+++ b/mupenplus/CommonAPIImpl_mupenplus.cpp
@@ -4,7 +4,6 @@
 
 int PluginAPI::InitiateGFX(const GFX_INFO & _gfxInfo)
 {
-	Lock lock(this);
 	_initiateGFX(_gfxInfo);
 
 	Config_LoadConfig();
diff --git a/windows/CommonAPIImpl_windows.cpp b/windows/CommonAPIImpl_windows.cpp
index 40489b6c..2872d294 100644
--- a/windows/CommonAPIImpl_windows.cpp
+++ b/windows/CommonAPIImpl_windows.cpp
@@ -14,7 +14,6 @@ BOOL CALLBACK FindToolBarProc( HWND hWnd, LPARAM lParam )
 
 int PluginAPI::InitiateGFX(const GFX_INFO & _gfxInfo)
 {
-	Lock lock(this);
 	_initiateGFX(_gfxInfo);
 
 	hWnd = _gfxInfo.hWnd;